Oil filter for internal combustion engines



Dec. 21,1943. F, H. GRIFFITH OIL FILTER FOR INTERNAL COMBUSTION ENGINES Filed Jan. 21, 1941 d b b 7 e e Q QN NW Patented Dec 21, 1943 v on. FILTER. i on Frank H. Griffith, Indiana, 179.. Application January 21, 1941,;Serial No. 375,34

The present invention consists of V for internal combustion engines and is especially adapted for use on heavy duty engines in farm tractors, road making machinery, etc.

gines of this character it is frequently necessary to change the oil daily due to the constant prev-- alence of dust while the engine is in operation.

My invention contemplates a filter the capacity of which is greatly in excess of conventional filters and equipped with multiple filtering means of a kind and arrangement to positively delete contaminating agents, such as dirt, wax, moisture, acid, etc., from the oil, permitting use of the latter for an indefinite period of time.

It is a further object of this invention to provide-a filter of inexpensive construction which may be easily and quickly disassembled, for repacking or renewing, even by a person unskilled in the art, this having been demonstrated in actual instances where the device. of the present invention is in use. In a typical case, an automobile engine equipped with my filter has been operated in the car for more than 82,000 miles the filter being repacked only three times at a cost of five cents per repack. In this cited instance there has been no manifestation of loss of engine effi ciency and the engine has, during this period,

undergone no repairs.

Other objects of the invention will be apparent from the following description of the present preferred form of the invention taken in connection with the accompanying drawing wherein:

Fig. 1 is a vertical sectional view of a filter constructed in accordance with the present invention,

Fg. 2 is a cross sectional view taken on the line 2-2 of Fig. 1 looking in the direction of the arrows, and

Fig. 3 is a detailed fragmentary sectional view of the inner shell showing to advantage the burrs issuing from the walls of the perforations.

The device of my invention includes a casing 4 which may be of cylindrical contour and provided with a dished base having an opening therein adapted for the reception of a nipple 5, the lower reduced end of which latter extends through the opening in the base of the casing and is welded or otherwise fixedly secured to the latter. The upper end of the casing is open and has the terminal thereoi bent outwardly at right angles to provide a flange ,6 the flange being adapted to have superimposed thereon a washer l. The open end of the casing is adapted to be closed by a cover 8 which is preferably symmetrical with the base of the casing 4 and is i'clai (01.210- 183 V j an oil filter.

equipped with a flange 9 wall with aring or band Iii. a part of which bends below the. flange! so "esto bridge the gap be tween'the superposed flanges B and 1 for an obvious purpose.

Mounted within the casing 4 are a pair of perforate members the outer of which is indicated at I 2 and the inner at I3. These members constitute outer and inner shells respectively each of which has perforations l4 therein through which the oil is adapted to flow in passing from the casing inlet opening l5 to the outlet bore l6 of the nipple 5.

The outer shell l2 may be of cylindrical contour and includes a friction tight bottom closure I! which engages annular flange It! the latter being formed by bending the bottom of the shell inwardly in spaced relation to the inner periphery of the shell. The top of the shell body I2 is bent inwardly to provide a lip I9 of arcuate configuration which is adapted for slidable engagement with a perforate closure 20 the latter forming the top of the outer shell l2. Centrally the closure 20 is pressed upwardly to provide a boss 2| which overhangs the upper curled end 22 of the inner shell l3. Interposed between the boss 2| and said curled end 22 is a washer 23. By this arrangement possibility of concaving the closure 20 is reduced to a minimum. The lower end of the inner shell extends through and is engaged with the lower face of the bottom closure I! in overhanging relation to the nipple 5. A washer 24 is interposed between the lower end of the inner shell and the top of said nipple as illustrated to advantage in Fig. 5. The shells l2 and 13 are anchored in the casing 4 by suitable means which in the present invention must consist of a tube 25 one end of which is detachably engaged with the nipple 5, the opposite end being engaged through a complemental opening formed in the boss of the closure 20 and secured by a nut 26. The upper end of the tube 25 is provided with internal threads which engage corresponding threads formed on the shank of a nut 27.

The outer shell is adapted for the reception of a bulk filtering material 28, such as cotton waste, which completely surrounds and encases the inner shell l3. The inner shell is wrapped with a sheet of filtering material 29 of considerably higher density than the waste 28, consisting of wool felt or a like material.

The perforations 14 of the inner shell l3 have V g the outer margin of which isbentat right angles to provide alipor annulus H) which circumscribes thewasher 8 and flange 5. The cover 8 is provided on itsinnen burrs I! issuing'outwardly Irom the walls there- 'oi. the burrs'being engaged with the sheet 28- of filtering material. Not only do the burrs tend to retain the sheet from displacement but by this structure P rous shells are provided over the. per- .forations I 4 at a point spaced outwardly" from the latter as shown to advantage in Fig. 2.

In. using the device of the present invention the oil from the engine pump enters the casing opening l5 and passes throughv the perforations in the wall and topof the outer shell [2. the heavy extraneous agents are intercepted by the filtering material 29 before contact of the oil is made with the filtering sheet 19; The latter, by reason of its construction and also .byreazson of its arrangement on the burrs of the inner shell l3, completes the interception of all extraneous materials which may have .passed through the primary filter 28. It is apparent therefore-that all materials eluding interception in the bulky mass 28, which constitutes the primary filter, are removed from the oil preparatory :to complete passage of the latter through the secondary filter 29. .After having passed through said secondary filter and the perforations ll :of the shell I13, the oil is permitted to gravitate downwardly said shell: and through an outlet peroration 30 formed in the tube 25, the perforabulk filtering material mounted in said outer shell, a sheet filtering element, of greater density than the material in said outer shell, Wrapped around the inner shell, the bulk completely enveloping and engaging said sheet filtering ele- 20.

ment, burrs extending from the walls of said perforations f or engagement with the sheet filtering material, a tube mounted within the inner sheli having an inlet-opening in communication with the oil outlet opening of the casing, and independent means engaged with each end of the tube and said shells for connecting the tube and shells to the casing.

FRANK H. GRIFFITH. 

